The new init-d-script from sysvinit 2.93-7 supports a
do_restart_prepare handler (see #920847). We need this handler to
prevent the daemons from starting up when the init scripts are invoked
with the "restart" argument, which is the case on package upgrades.
Note that this is safe (no-op) on previous versions of sysvinit that
do not support this handler.